— 21 — 



erfolgte, so haben doch gerade die Untersuchungen Fields viel zur 

 Klärung des Problems beigetragen. Die Entwicklungsgeschichte blieb 

 nun auch weiter seine Lieblingsdisziplin und die Amphibien diejenige 

 Tiergruppe, aus der er sein üntersuchungsmaterial holte, bis ihn sein 

 Lebenswerk, die zoologische Bibliographie, so vollständig in Anspruch 

 nahm, dass er auf wissenschaftliche Einzeluntersuchungen verzichten 

 musste. 



Fields wissenschaftliche Betätigung auf einem Gebiete, das schon 

 damals eine äusserst umfangreiche Literatur aufwies, und besonders der 

 Umstand, dass die älteren Angaben oft sehr versteckt waren und in 

 keiner Weise durch den Titel der Abhandlung manifest wurden, das 

 hat gewiss dazu beigetragen, in ihm das Verlangen nach bibliographi- 

 scher Reform zu nähren, ein Verlangen, welches durch sein Zusammen- 

 arbeiten mit seinem Lehrer Mark geweckt worden war. 



Prof. E. L. Mark, heute hochbetagt, aber noch in voller Frische 

 und Rüstigkeit und für die Wissenschaft, die ihm so vieles zu danken 

 hat, tätig, war so gütig, die folgenden Zeilen über seinen Schüler Field 

 zur Verfügung zu stellen. Dafür werden ihm alle Freunde Fields herz- 

 lichen Dank wissen. 



Prof. Mark schreibt: 



„As a Student at Harvard, Field was industrious and studious. 

 He was interested in many things, and often held protracted discus- 

 sions with fellow students or with his instructors over controversial 

 matters. He was fond of narrating his expériences, and took as much 

 pleasure in recounting his own misadventures as those of others. He 

 acq.uired skill and dexterity in technique, and even collaborated with 

 another student in planning a new microtome ; but want of practical 

 mechanical expérience prevented their overcoming some of the obstacles 

 they encountered, so that their microtome never reached a stage that 

 warranted its manufacture. 



Among many questions discussed in the laboratory, that of biblio- 

 graphy received his earnest and enthusiastic attention. For several years 

 it had been my custom to require of students, as a part of their trai- 

 ning preliminary to regulär problems of investigation, not only familia- 

 rity with the then ratber modern technique required in microscopie 

 anatomy, but also expérience in bibliographie methods in connection 

 with their reading. Students were encouraged to form the habit of 

 making out their bibliographie références on separate cards of standard 

 size, and advised always to carry about with them blank cards for 

 this purpose, as well as that of making abstracts and notes from their 

 reading; methods of indexing, in compact form on cards, subjeets of 

 personal interest were also explained and discussed. It was here, un- 

 doubtedly, that Field got his first appréciation of the need of systematic 

 bibliographie work for the zoölogist. While he feit — like all zoölogists — 

 the need of comprehensive bibliographie work for the period following 

 the year 1860, he was most impressed by the need of prompt infor- 

 mation on current publications. 



